The sixteen 'Cyclists Dismount' signs are unhelpful. Use of them breaks both the recommendation for 'convenience' in the principles from Cycling England and the 'Hierarchy of Users' from the Manual for Streets, both on the previous page. The signs are often used by highway authorities to disguise the lack of good design. Specific suggestions are given below, and it is important to note that provision for cycles on the main carriageway negates the need for explicit cycle flow management as the cycle is then part of the main traffic flow.
Reference  says this about the sign;
3.6.1 The CYCLISTS DISMOUNT sign to diagram 966 is another over-used sign. On a well designed cycle facility, it is very rarely appropriate. The sign is possibly the least favoured among cyclists - each time it is used, it represents a discontinuity in the journey, which is highly disruptive. 3.6.3 If it looks as if the sign might be needed, practitioners should first check to see whether the scheme design could not first be modified to make its use unnecessary. In general, the sign should not be used where a cycle track joins a carriageway directly.
The current A3 from Hammer Lane to the Hindhead Crossroads should be modelled as a small village street in order to remove the severance in Hindhead village. The existing width should be reused to create wide pavements and a roadway with a 2m wide advisory cycle lane on each side. The centre line should be removed from the roadway to further enhance the image of a narrow village street. There are many precedents for this kind of approach, both in the UK and in other parts of Europe. Unless this type of modelling is carried out, the effect of this straight road on a hill will be to encourage excessive speed, and there will be continuing campaigns for explicit traffic calming in the future.
The speed limit from Hammer Lane to the Hindhead crossroads should be no greater than 30 mph to encourage a village atmosphere and reduce risk for cyclists.
The route signs show Petersfield as the destination in the southbound direction. This is roughly 12 miles away, which is about an hour's journey for an average cyclist. A far more useful destination would be Liphook, which is the nearest town and the first chance to break away from the unpleasant experience of cycling alongside heavy fast traffic.